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Super-comfy walking shoes You will be doing a lot of walking in Barcelona, so the key is to be comfortable. Try to avoid bringing shoes you have not broken in. Tennis shoes (trainers, sneakers), hiking shoes or other types of durable sports shoes are probably your best bet. If you don't want to look like a tourist, dress fashionable!
All-weather gear. During the winter, early spring and late fall seasons, be prepared for rainy and windy conditions. Ideal are lightweight hoodies like the highly weatherproof Arc'teryx Squamish jacket, which is breathable, too – handy for when the weather clears up again. Tuck a good (but compact) umbrella, like Repel's Windproof Travel Umbrella with Teflon Coating, into your bag, in case of a real downpour.
Power adapter and charger. In Spain the power sockets are of type F (his socket also works with plug C and plug E). The standard voltage is 230 V and the standard frequency is 50 Hz. A type F power adapter is included in this world adapter set from Bestek, and a multiport charger, like Anker’s compact Powerport 4.
Packing cubes. They not only keep your suitcase organized, but also compact your clothes to save space. One of frequent travellers'favorites are Eagle Creek‘s Pack-It cubes, which come in different sizes so you can tailor your setup to your needs.
Travel guides. Lonely Planet has a great guide to Barcelona; Gaze in wonder at Gaudi's Sagrada Familia, stroll along La Rambla and the ancient streets of the Barri Gotic, and take your pick of tapas joints.
A great source of information is the official Barcelona Tourist Office website that provides great insider tips to the region. Also check out Time Out Barcelona.